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-rw-r--r--src/lib/formats/trs_cas.cpp8
1 files changed, 8 insertions, 0 deletions
diff --git a/src/lib/formats/trs_cas.cpp b/src/lib/formats/trs_cas.cpp
index 17ce879eba7..7d161d7c218 100644
--- a/src/lib/formats/trs_cas.cpp
+++ b/src/lib/formats/trs_cas.cpp
@@ -43,6 +43,14 @@ static int trs80l2_handle_cas(int16_t *buffer, const uint8_t *casdata)
int data_pos = 0, sample_count = 0;
bool sw = false;
+ // Make sure this is a trs80 tape
+ // Should have some zero bytes then one 0xA5
+ while ((cas_size > data_pos) && (casdata[data_pos] == 0x00))
+ data_pos++;
+ if (casdata[data_pos] != 0xA5)
+ return 0;
+
+ data_pos = 0;
while( data_pos < cas_size )
{
uint8_t data = casdata[data_pos];